Light sensitive planographic printing plate material and manufacturing process of printing plate employing the same

Abstract

Disclosed is a light sensitive planographic printing plate material comprising a support and provided thereon, a light sensitive layer containing a spectral sensitizer, a polymerization initiator, a polymerizable monomer and a polymeric binder, wherein the light sensitive planographic printing plate material comprises a surfactant represented by the following formula (SF1) or (SF2), R 1 —O—(R 2 —O) n —H   Formula (SF1) R 3 O—[CH 2 CH(CH 3 )O] l (CH 2 CH 2 O) m —H   Formula (SF2)

1 . A light sensitive planographic printing plate material comprising a support and provided thereon, a light sensitive layer containing a spectral sensitizer, a polymerization initiator, a polymerizable monomer and a polymeric binder, wherein the light sensitive planographic printing plate material comprises a surfactant represented by the following formula (SF1) or (SF2),
   R 1 —O—(R 2 —O) n —H   Formula (SF1)   wherein R 1  represents a substituted or unsubstituted branched alkyl group having a total carbon atom number of not more than 20 or a substituted or unsubstituted branched alkyl amino group having a total carbon atom number of not more than 20; R 2  represents a substituted or unsubstituted alkylene group having a carbon atom number of from 1 to 10; n represents an integer of 2 to 100, provided that plural R 2 s may be the same or different,
   R 3 O—[CH 2 CH(CH 3 )O] l (CH 2 CH 2 O) m —H   Formula (SF2) 
   wherein R 3  represents an alkyl group having a carbon atom number of from 4 to 10; l represents an integer of from 1 to 3; and m represents an integer of from 1 to 100.   
     
     
         2 . The light sensitive planographic printing plate material of  claim 1 , wherein the light sensitive layer contains the surfactant represented by formula (SF1) or (SF2). 
     
     
         3 . The light sensitive planographic printing plate material of  claim 1 , wherein an oxygen shielding layer containing polyvinyl alcohol is provided on the light sensitive layer. 
     
     
         4 . The light sensitive planographic printing plate material of  claim 3 , wherein the oxygen shielding layer contains the surfactant represented by formula (SF1) or (SF2). 
     
     
         5 . The light sensitive planographic printing plate material of  claim 1 , wherein the polymerization initiator is an iron-arene complex. 
     
     
         6 . The light sensitive planographic printing plate material of  claim 1 , wherein the polymerization initiator is a hexaarylbiimidazole. 
     
     
         7 . The light sensitive planographic printing plate material of  claim 1 , wherein the spectral sensitizer is a coumarin derivative represented by formula (CS), 
       
         
           
           
               
               
           
         
       
       wherein R 1  through R 6  independently represent a hydrogen atom or a substituent. 
     
     
         8 . The light sensitive planographic printing plate material of  claim 1 , wherein the polymerizable monomer is a polymerizable compound having in the molecule a hydroxyl group. 
     
     
         9 . The light sensitive planographic printing plate material of  claim 1 , wherein the light sensitive layer contains, as the polymeric binder, a homopolymer or copolymer of N-vinyl pyrrolidone. 
     
     
         10 . A manufacturing process of a planographic printing plate comprising the steps of:
 (a) imagewise exposing the light sensitive planographic printing plate material of  claim 1 , employing a laser; and   (b) removing the light sensitive layer at unexposed portions at 25° C. with an aqueous solution with a pH of 3.0 to 9.0 containing a water soluble resin and a surfactant.   
     
     
         11 . The manufacturing process of  claim 10 , wherein the laser has an emission wavelength of from 350 to 450 nm. 
     
     
         12 . The process of  claim 10 , wherein the surfactant contained in the aqueous solution is a surfactant represented by formula (SF1) or (SF2). 
     
     
         13 . The manufacturing process of  claim 10 , between the steps (a) and (b), further comprising the step of heating the exposed light sensitive planographic printing plate material so that the surface temperature of the exposed material is from 80 to 160° C. 
     
     
         14 . A manufacturing process of a planographic printing plate comprising the steps of:
 (a) imagewise exposing the light sensitive planographic printing plate material of  claim 3 , employing a laser;   (b) removing the oxygen shielding layer and a part of the light sensitive layer of the exposed material, employing water; and   (c) then removing the light sensitive layer at unexposed portions with an aqueous solution with a pH at 25° C of 3.0 to 9.0 containing a water soluble resin and a surfactant.   
     
     
         15 . The manufacturing process of  claim 14 , wherein the laser has an emission wavelength of from 350 to 450 nm. 
     
     
         16 . The process of  claim 14 , wherein the surfactant contained in the aqueous solution is a surfactant represented by formula (SF1) or (SF2). 
     
     
         17 . The manufacturing process of  claim 14 , between the steps (a) and (b), further comprising the step of heating the exposed light sensitive planographic printing plate material so that the surface temperature of the exposed material is from 80 to 160° C.